Fastener for roofing sheets



Nov. 20, 1928.

D. R. BARD FASTENER FOR ROOFING SHEETS Filed March 31, 1928 Qwuentoz aw2M Patented Nov. 20, 1928.

'- UNIT D sures DALE R. BARnoFBRYAN, orrro.

FASTENER FOR ROOFING SHEETS.

Application filed March 31, 1928. Serial No 268,139.

An object of this invention is to provide a simple and efiicientfastener for roofing sheets which will not tear the sheets when windblows under the sheets and causes flapping 1 thereof, but permitsfiappingmovement of the sheets relative to the fasteners withoutaffecting the seal or damaging the sheets. Other objects willhereinafter appear.

An illustrated embodiment of the invention is shown in the accompanyingdrawings, in which: i

Fig. 1 is a top plan view of the nailing strip showing the mannerinwhich it. is applied;

Fig. 2 is a perspective view of one of the fasteners;

Fig. 3 is a diagrammatic view to show the curvature of the nailreceiving portion; and

Fig. 4 is a transverse section through the nail receiving portion of oneof the fasteners in Fig. 1.

The illustrated embodimentof the invention comprises apair of roofingsheets 1, which Y are separated at their adjacent edges in the usualmanner as applied for roofing purposes, leaving a space 2 betweencontiguous sheets. In order to seal this space, a nail-receiving strip 3spans the space and provides a weather resistant seal. Each strip 3 maybe of about 80 inches in length, and is made of relatively light gagesheet metal, being composed of a plurality of individual cleats orfasteners 4 integrally connected to each other.

The strip 8 is secured in place by nails 5 extending through holes inindividual fasteners 4. Each fastener is provided with a raisednail-receiving portion 6, thereby pro viding a concavo-convex form. Thenail-receiving, portion 6 converges from opposite ends towards thecentral part, and is symmetrically curved in the manner shown. I

As diagrammatically indicated in Fig. 8, a line 7, drawn tangent to thecenter of the nail-receiving portion, forms with a chord 8 from thecenter of the nail-receiving portion 12. By virtue of this construction,the nail-receiving portion is spaced but a slight distance away from thesurface to which it is attached, but the elevation is sufficient so thatwhen force is applied by driving a nail into place, all edges thereofare forced into intimate sealing engagement withthe engaging surface.Depending from opposite sides of the nailreceiving portion 6 arevertically disposed,

outwardly inclined sides 9. The sides 9 form,

with the adjacent edge of the nail-receiving portion,'a sector, therebyproviding a construction which, when the upper surface'of thenail-receiving portion is struck by a hammer or other tool, the sidesare forced inclinedly downward into the roofing material, and at thesame time the ends are forced into lntimate engagement with the materialengaged.

A cardinal feature of 'thisinvention consists in providing upturnedlongitudinal, edges 10 at each side of the cleat forming a continuousflange on opposite sides of the nailing strip. The one advantage of theflanges 1O isthatwhen the cleat or strip is in I place, liabilityoftearing or severing the roofing material is prevented.

In case of partially worn sheets permitting the wind to get under thesame and flap them,

it is found that the ordinary nailing strips are not satisfactory,because of the sharp side edges acting as knives to sever the flap-'ping sheets along the line of connection.

By'my construction it is apparent that the liability of tearing of thesheets is eliminated, as the sharp edges at the'side of the strip areeliminated, and a curved edge is provided.

While I have provided a. construction which satisfies the objectsprimarily stated, it is to be understood that numerous changes indetails of construction and arrangement may be eflected withoutdeparting from the spirit of. the invention as defined in the followingclaim, and the above description is to be considered byway ofillustration and not of limitation.

What I claim as new and by Letters Patent is: j

A sheet metal fastener having a rectangular desire to secure base, flatlongitudinal and symmetrically curved nail-receiving portion, thecurvature from opposite ends being such that a line tangent to thecenter thereof forms with a chord from such center to either end anangle of the order of 12, said nail-receiving portion diverginguniformly in opposite directions from the central part thereof, andsides de pending downwardly and outwardly from said nail-receivingportion, and upturned flanges 0n the side edges thereof.

In testimony whereof I have hereunto signed my name to thisspecification. DALE R. BARD.

